Sun Biscayne Tandem 7 vs Trek 520 Grando

Compare Specifications of Sun Biscayne Tandem 7 and Trek 520 Grando

Selected Bikes

Sun Biscayne Tandem 7
Sun Biscayne Tandem 7

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Trek 520 Grando
Trek 520 Grando

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Technical Specifications
Load Carrying Capacity -- Combined weight of bicycle, rider, and cargo of 275 pounds (125 kg)
Drivetrain K.M.C. 1/2" x 1/8", Black (152 Links) --
Frame High Tensile Steel, TIG-Welded Trek butted chromoly disc touring, rack & fender mounts, 135 x 5 mm QR
Stem Alloy, 25.4 x 180mm Quill x 80mm Ext. x 25.4 Clamp, Black
Stoker Stem:Alloy, Adjustable Reach (4-Bolt Face) Black
Size : 48 - Bontrager Elite, 31.8 mm, Blendr compatible, 7 degree, 80 mm length
Size : 51 - Bontrager Elite, 31.8 mm, Blendr compatible, 7 degree, 90 mm length
Size : 54, 57 - Bontrager Elite, 31.8 mm clamp, Blendr compatible, 7 degree, 100 mm length
Size : 60, 63 - Bontrager Elite, 31.8 mm clamp, Blendr compatible, 7 degree, 110 mm length
Handle Bar Steel, 28.4" Wide x 7.3" Rise x 25.4 Clamp, Black
Stoker Handlebar: Steel, 27" Wide x 10.8" Rise x 25.4mm Clamp, Black
Size : 48 - Bontrager Comp VR-C, alloy, 31.8 mm, 100 mm reach, 124 mm drop, 40cm width
Size : 51, 54 - Bontrager Comp VR-C, alloy, 31.8 mm, 100 mm reach, 124 mm drop, 42cm width
Size : 57, 60, 63 - Bontrager Comp VR-C, alloy, 31.8 mm, 100 mm reach, 124 mm drop, 44cm width
Fork 1-1/8" High Tensile Steel, Curved Legs, Double Eyelets 520 alloy disc touring, rack mounts, 100 x 5 mm ThruSkew
Seatpost Alloy w/o Clamp, 25.6 x 350mm, Black Size : 48 - Bontrager alloy, 27.2 mm, 12 mm offset, 250 mm length
Size : 51, 54, 57, 60, 63 - Bontrager alloy, 27.2 mm, 12 mm offset, 330 mm length
Grip Foam, Black --
Crankset -- Size : 48, 51 - ProWheel forged alloy, 42/28, 2-piece, 170 mm length
Size : 54, 57, 60, 63 - ProWheel forged alloy, 42/28, 2-piece, 175 mm length
Pedals Slip Resistant Top, 9/16", Black Wellgo nylon body, alloy cage
Chain K.M.C. 1/2" x 3/32", Black (130 Links) KMC X10, 10 speed
Shifters Shimano 7-Speed Revo Twist Shifter Shimano Tiagra R4700, 10 speed
Saddle Comfort Cruiser, Elastomer Suspension, Black Bontrager Arvada, steel rails, 138 mm width
Headset Steel, 25.4 x 34 x 30mm, Black 1-1/8'' threadless, sealed cartridge bearings
Derailleur Front -- Shimano Tiagra 4700, 34.9 mm clamp, down swing
Derailleur Rear Shimano RD-TX35 Tourney Shimano GRX RX400, long cage, 36T max cog
Hub Front Alloy, 36H x 14G with 3/8" Bolt-On Axle, Black (For Freewheel) Shimano M475, 6-bolt disc, 135 x 5 mm QR
Hub Rear Alloy, 36H x 14G x 3/8" Bolt-On Axle, Black Shimano M475, 6-bolt disc, 100 x 5 mm QR
Spoke 14G Stainless Steel with Brass Nipples 14g stainless steel
Cassette -- Shimano HG50, 11-36, 10 speed
Bottom Bracket BC1.37'' x 24TPI, Steel, Caged Bearings
Spindle:Bolt Type, 119mm
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Stand Alloy, Center Mount, Black --
Tyres
Front Beach Bum 26 x 2.125", Black Wall Bontrager GR1 Expert, Hard-Case Lite, wire bead, 60 tpi, 700 x 40c
Rear Beach Bum 26 x 2.125", Black Wall Bontrager GR1 Expert, Hard-Case Lite, wire bead, 60 tpi, 700 x 40c
Wheel / RIM Rims:26" x 36H x 14G, Red
Front: 26" x 1.75 x 36H x 14G Alloy-Cruiser, Bolt-On
Rear: 26" x 1.75 x 36H x 14G Alloy-Cruiser, (FOR FREEWHEEL)
Bontrager Affinity Disc, Tubeless Ready, 36-hole, 21 mm width, presta valve
Brakes
Front Alloy (Linear Pull) Black TRP Spyre C 2.0 mechanical disc, 160 mm rotor
Rear Alloy (Linear Pull) Black TRP Spyre C 2.0 mechanical disc, 160 mm rotor
Brake Lever Alloy (Linear Pull) Black / Silver --
Suspension
Front -- --
Rear -- --
Colors Available
Colors -- Nautical Navy


Physical Specs
Length -- --
Weight 27.2 kg 13.28 kg
Overview
Features -- --
Additional Details Captain Crank Left: 3-Piece Alloy, 170mm x 42T x 1/2" x 1/8", Black (For Diamond Square Cranks)
Captain Crank Right: 3-Piece Alloy, 170mm, Black (For Diamond Square Cranks)
Freewheel: Shimano TZ-21 (7-Speed) 14-28T
Captain Crank Right: 3-Piece Alloy, 170mm, Black (For Diamond Square Cranks)
Stoker Crank Left: 3-Piece Alloy, 170mm x 42T x 1/2" x 1/8", Black (For Diamond Square Cranks)
Stoker Crank Right: 3-Piece Alloy, 170mm x 42T x 1/2" x 3/32", Black (For Diamond Square Cranks)
Chainwheel: Steel, Silver Painted W/Plastic Chain Cover
Pulley Adjuster:Eccentric BB Insert
Seat Clamp: Alloy, 28.6mm I.D., with Double Bolt, Black
Stoker Seat Clamp: Alloy, 34.9mm I.D., Black
Front Fender: Steel, W/Single Strut, Painted
Rear Fender: Steel, W/Single Strut, Painted
Fender Set: Plastic, F&R W/Rubber Bump Guards, Silver
Cargo rack : Bontrager Carry Forward

Which one do you think is better? And why?
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